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Zorluk: ZorNetworking Ports and Protocols

A network security technician is updating firewall access control lists (ACLs) following a security policy enforcement mandate requiring all mail access to transition from unencrypted protocols to SSL/TLS encrypted standards. Users report that while outbound mail transmission works, email clients fail to synchronize folder structures and message status across multiple mobile and desktop devices. Diagnostics reveal that unencrypted IMAP traffic on TCP port 143 is being blocked as intended. Which port and transport protocol combination must be permitted through the perimeter firewall to restore encrypted, multi-device mail synchronization?

  1. TCP port 993Cevap
  2. B
    TCP port 995
  3. C
    UDP port 993
  4. D
    TCP port 587

Cevap

TCP port 993 must be permitted to allow IMAPS traffic for secure multi-device email synchronization.
IMAPS (Internet Message Access Protocol Secure) operates over TCP port 993 to establish an SSL/TLS encrypted session that enables seamless folder and status synchronization across multiple devices.

Adım Adım Çözüm

1
Identify the required functional capability from the scenario.
The requirement demands multi-device folder and message state synchronization, which specifies the IMAP protocol family rather than POP3.
IMAP keeps messages on the server and synchronizes status (read, flagged, folders) across multiple clients, whereas POP3 downloads and removes/stores messages locally.
2
Determine the secure equivalent port for unencrypted IMAP.
Unencrypted IMAP uses TCP port 143, while IMAPS (IMAP over SSL/TLS) uses TCP port 993.
CompTIA A+ Core 1 standards require distinguishing between unencrypted protocols and their secure SSL/TLS port counterparts.
3
Verify the correct Layer 4 transport protocol.
Email retrieval protocols require reliable stream delivery, mandating TCP rather than UDP.
TCP guarantees ordered, loss-free packet delivery necessary for mailbox content retrieval.

Anahtar Kavram

Distinguishing secure vs. unencrypted mail retrieval protocols and their associated TCP/UDP port assignments.
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Konular

Networking Ports and Protocols

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